From what I have read in passing, aren't they able to simulate and remix the mb of 24fps in post? Magic motion I think it is called?

I don't think there is too much need for concern. 48fps is for the 3D showings, 24 fps will be for the standard 2D showings, which will have fluid motion-blur applied to "fill in the gaps" and prevent choppiness

The only problem might be since digital is clear and without grain, you lose the sparkle and shimmer, which of course can be added to the finished look of the video. If you are a regular movie watcher you've been seeing video projection for a few years, now.

Too much resolution, too much detail? Maybe. But who really wouldn't want to have that problem to deal with, rather than the other way around, especially when dealing with post?